Four years have gone by since the two preschool boys profiled in Autism and Applied Behavioral Analysis began intensive ABA therapy-formerly considered controversial, but now hailed as one of the few effective approaches to treating the disorder. This ABC News program brings viewers up to date on the boys and further explains the benefits of ABA in treating autism. But the program communicates a sense of frustration, as well-with the financial expense of ABA therapy, with the limited success of even this form of autism treatment, and with how much is simply still not understood about this mysterious disorder.